We have explored Junk dimension and Degenerate dimension in previous posts, now we are going to discuss Role playing dimension in this post. Lets start with the definition followed by an example. Role playing dimension A fact table keeps the facts of a business process. It is built of two types of columns: measure columns and dimension key columns. Measure are the quantitative business data […]
We have discussed the use of junk dimensions in data modelling and in this post we are going to explore Degenerate dimension. Lets start with the definition. Degenerate Dimension A high cardinality attribute column in the fact table which does not have any other content except its natural key and is required as a dimension for analysis or
What is a Junk Dimension? Have you ever come across a scenario where many small dimension tables connect (using foreign key) to the fact table? In data warehouse, we have two types of tables, Fact and Dimension. Fact table contains business facts as measures and references to the dimension tables. Dimension tables have attributes which contains textual information of business facts and
